| 摘要 |
An input device (22) includes an illuminated keyboard (24) and a display controller (28) for displaying characters on depressible keyboard locations or buttons (90). The display controller changes the displayed characters according to a selection of a character set and application of modifiers (42), such as shift, alternate, or control. The input/output device also includes a light sensor (26) for sampling the ambient light level in the vicinity of the input/output device. Based on the ambient light level, the display controller (28) adjusts the intensity of the displayed character, its background, and the contrast between the displayed character and its background. The depressible keyboard locations (90) may be buttons connected to mechanical switches to allow a user to rapidly type information into the input device. The display controller can be controlled by either user-selectable switches (30) or by the operating system (34) or software applications (38) of an attached computing device (32).
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